%!TEX TS-program = xelatex
%!TEX encoding = UTF-8 Unicode

\documentclass[11pt,tikz,border=1]{standalone}
\usetikzlibrary{math}

\begin{document}
\begin{tikzpicture}[
    tick/.style={font=\scriptsize}
  ]
  
  \draw (-6,0) -- (6,0);
  \foreach \x in {-30, -20, -10, 0, 10, 20, 30}
  \draw (\x / 5, 0) -- (\x / 5, -0.1) node[tick,below]{$\x$};
  
  \draw (0,0) -- (0,7);
  \draw (0,7) -- (-0.1, 7) node[tick,left] {$0.4$};
  
  \tikzmath{
    % Gaussian distribution:
    function gaussian(\x, \m, \s) {
      return (1 / (sqrt(2 * pi) * \s)) * exp(- (pow(\x - \m,2)) / (2 * pow(\s, 2)));
    };
    {\draw[blue,domain=-5:5,samples=201,xscale=0.2] plot (\x, {gaussian(\x, 0, 1.22) * 17.5});};
  }
  
\end{tikzpicture} 
\end{document}
